This study used culture based methods to assess efficacy. It would also be interesting to see if there is any taxonomic bias in which bacteria and fungi are killed by this disinfectant.

Although the authors state that the US EPA has found that exposure to low concentrations of chlorine dioxide is not harmful to people, I wonder about the consequences of repeated exposure to this respiratory irritant. This article by the World Health Organization suggests that there are few studies on the effects of repeated exposure.